Mr. David Greenway reports

GIANT MINING SUBMITS ASSAYS FOR 595-FOOT HOLE MHB-35, PROCESSES AI DRIVEN DISCOVERY HOLE MHB-36, AND LAUNCHES SPECIAL WARRANT FINANCING AT MAJUBA HILL COPPER PROJECT

Giant Mining Corp. has sampled and submitted all core from drill hole MHB-35 -- completed to a total depth of 595 feet (181.7 metres), inclined at minus 45 degrees with an azimuth of 270 degrees -- to ALS Global Services (ALS Labs) for analysis. This hole was part of the company's phase 1 spring 2025 drill program, which comprised five diamond drill holes totalling 5,484.5 feet (1,671.7 metres) at the Majuba Hill porphyry copper-silver-gold project, located in Pershing county, Nevada.

The phase 1 program was designed to expand known zones of copper mineralization and advance the Majuba Hill project toward completion of a mineral resource estimate (MRE). Hole MHB-32, the first of the five holes drilled, returned two significant copper-mineralized zones within a broader interval of 379.5 feet (115.7 metres) grading 0.33 per cent copper and 16.97 parts per million silver. Notably, the results included 169.5 feet of 0.41 per cent copper, with higher-grade intervals of 40 feet at 1.36 per cent copper and 10 feet at 4.36 per cent copper, indicating that mineralization extends deeper and farther north than previously known (see press release dated May 22, 2025).

MHB-36 now being processed for shipment to ALS Labs

Hole MHB-36 was completed to a depth of 1,100 feet (335.3 metres) and is now being processed in preparation for shipment to ALS Labs. This hole was strategically designed using Exploration Technologies Inc. (ExploreTech) and its proprietary probabilistic, AI-driven (artificial intelligence) geophysical modelling, which significantly enhances the company's targeting capabilities for this phase of the program. ExploreTech's software automatically optimizes drill targeting, enabling companies to make smarter, faster and more cost-effective drilling decisions.

"With assays pending from holes MHB-34 and MHB-35 and MHB-36 now being processed for shipment to ALS Labs, we're very encouraged by the progress of our 2025 drill program," said David Greenway, president and chief executive officer of Giant Mining Corp. "These results are expected to enhance our evolving deposit model at Majuba Hill, which we believe is shaping up to be a world-class copper, silver and gold discovery. Located in a top-tier jurisdiction with strong infrastructure, the project aligns with America's critical minerals and clean energy priorities. With our special warrant financing now under way, we're well positioned to accelerate development and build long-term shareholder value."

MHB-36 intersected visual disseminated and vein-hosted chalcopyrite mineralization within the targeted breccia zone, beginning at a downhole depth of 650 feet (198 metres). Mineralization was observed intermittently continuing beyond 905 feet (274.32 metres).

As stated in the May 9, 2025, news release, the fifth drill hole originally targeted a depth of 1,000 feet (305 metres), inclined at 70 degrees with an azimuth of 220 degrees. The hole was designed by ExploreTech using its proprietary AI-assisted geophysical modelling system to target a high-potential resistivity anomaly identified in the southern sector of the project area. Upon completion of these five drill holes, the company's cumulative exploration and development drilling will exceed 88,000 feet (26,822 metres), providing a significantly enhanced geological and geophysical data set to refine the deposit model and guide subsequent resource estimation.

The successful intersection of targeted mineralization, as predicted by ExploreTech's AI-driven geophysical modelling, provides a strong foundation for optimizing future drill programs in 2025, 2026 and beyond. Once MHB-36 is shipped to ALS Labs, all core from the current program will be submitted, with assays pending for integration into the company's National Instrument 43-101 deposit model.

Special warrant financing

The company further announces a non-brokered private placement of up to 15 million special warrants of the company at a price of 20 cents per special warrant for aggregate gross proceeds of up to $3-million.

Each special warrant will automatically convert, for no additional consideration, into one unit of the company on the date that is the earlier of: (i) the date that is three business days following the date on which the company files a prospectus supplement to a short-form base shelf prospectus with the securities commissions qualifying distribution of the units underlying the special warrants; and (ii) the date that is four months and one day after the closing of the offering.

Each unit will comprise one common share of the company and one share purchase warrant of the company, with each warrant exercisable into one additional share at an exercise price of 32 cents for four years from the date of closing. The warrants are subject to an accelerated expiry if the trading price of the shares on the Canadian Securities Exchange, or such other market as the shares may trade from time to time, is or exceeds 80 cents for any five consecutive trading days, in which event the warrantholder may, at the company's election, be given notice by way of a news release that the warrants will expire 30 days following the date of such notice. The warrants may be exercised by the warrant holder during the 30-day period between the notice and the expiration of the warrants.

The warrants will be subject to a 10-per-cent-blocker provision that restrict the exercise of any warrants, in the event that such exercise would result in the applicable securityholder holding 10 per cent or more of the issued and outstanding shares at such time.

The company may pay finders' fees on the offering within the amount permitted by the policies of the CSE. The company will use the net proceeds from the offering for operations and administrative costs.

The company intends to use the proceeds raised from the offering for continuing exploration activities and general working capital. The offering is subject to certain conditions, including, but not limited to, receipt of all necessary approvals, including the approval of the CSE.

The special warrants are expected to be issued pursuant to exemptions from the prospectus requirements under Canadian securities laws, such as the accredited investor, $150,000 minimum investment or other relevant exemptions under National Instrument 45-106, Prospectus Exemptions. Prior to the filing of the prospectus supplement and the automatic conversion of the special warrants, the securities issued under the offering will be subject to a four-month hold period from the date of closing of the offering in addition to any other restrictions under applicable law.

Quality assurance/quality control (QA/QC) measures and chain of custody

The company utilizes a QA/QC program using best industry practices at the Majuba Hill project. Drill core samples are sawn in half lengthwise and one-half is placed in labelled cloth sample bags. Sample bags are transported from the Giant Mining secure warehouse to the ALS Labs sample prep facility in Elko, Nev. ALS Labs then securely transports the prepared pulps to its analytical lab in North Vancouver, B.C.

All samples are analyzed for copper, gold, silver and 33 other elements. Gold is determined by ALS Labs method Au-AA23, which is a fire assay with an AAS finish on a 30-gram split. Copper, silver and the remaining 31 elements are determined by ALS Labs method ME-ICP61, which is a four-acid digestion and ICP-AES assay. Approximately 5 per cent of the submitted samples are drill duplicates and copper-gold-porphyry commercial standard reference material pulps.

Qualified person

The scientific and technical information contained in this news release has been reviewed and approved by E.L. (Buster) Hunsaker, CPG No. 8137, a non-independent consulting geologist who is a qualified person as such term is defined under NI 43-101, Standards of Disclosure for Mineral Projects.

About Giant Mining Corp.

Giant Mining is focused on identifying, acquiring and advancing late-stage copper and copper/silver/gold projects to meet the growing global demand for critical metals. This demand is driven by initiatives such as the Green New Deal in the United States and similar climate-focused programs worldwide, which require substantial amounts of copper, silver and gold for electric vehicles, renewable energy infrastructure, and the modernization of clean and affordable energy systems.

The company's flagship asset is the Majuba Hill copper, silver and gold district, located 156 miles (251 kilometres) from Reno, Nev. Majuba Hill is situated in a mining-friendly jurisdiction with supportive regulations and has the potential to become one of the next major copper deposits, critical for meeting the increasing need for this red metal.

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